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          <h1 id="Innodb-的-MVCC"><a href="#Innodb-的-MVCC" class="headerlink" title="Innodb 的 MVCC"></a>Innodb 的 MVCC</h1><p>说到 MVCC 大家都知道，这个是为了提高数据的并发能力。如果数据库只能有一个线程来处理数据的读取和更新，那么肯定是不行的。</p>
<p>为了解决顺序读取，那么第一步想到的肯定是，读写锁。将 Read Lock 和 Write Lock 分开，那样不就可以实现多线程操作了。</p>
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<p>Read Lock 和 Write Lock</p>
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          <h1 id="Producer-和-Broker-的交互，Consumer-和-Broker-的交互是通过-Msg-来实现的吗？"><a href="#Producer-和-Broker-的交互，Consumer-和-Broker-的交互是通过-Msg-来实现的吗？" class="headerlink" title="Producer 和 Broker 的交互，Consumer 和 Broker 的交互是通过 Msg 来实现的吗？"></a>Producer 和 Broker 的交互，Consumer 和 Broker 的交互是通过 Msg 来实现的吗？</h1><p>答案：是的。</p>
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            <a href="/blog/2020/02/09/2020/2020%E6%96%B0%E7%9A%84%E5%BC%80%E5%A7%8B/" class="post-title-link" itemprop="url">职场定位的变化思考</a>
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          <p>最新在重新看《SRE Google 运维解密》，边看边思考自己在公司中的定位，对于开发职场的定位变迁又有了一点新的理解，不妨一起来看看。</p>
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          <h1 id="又一次阿里系面试"><a href="#又一次阿里系面试" class="headerlink" title="又一次阿里系面试"></a>又一次阿里系面试</h1><blockquote>
<p>为什么二面给我的评价是P5+，连 P6 都没有。</p>
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<p>虽然最后还是给了P6的Offer，但是因为被卡HC了，所以劝诫各位3、4月份，不要去阿里面试。</p>
<p>缺少实战的一些业务场景的实践。</p>
<p>基础的Java问题，永远是那么一些，当对于面试者的技术储备有了一定的了解之后，都是回到业务。就像动画一样，会给面试者很多假设，这些假设脱胎于平时的业务，却更加的上层（因此也考验面试官的实力）。</p>
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          <blockquote>
<p>我并不渴望远方，只想陪你去流浪 –《这是我一生中最勇敢的瞬间》</p>
</blockquote>
<h2 id="感悟"><a href="#感悟" class="headerlink" title="感悟"></a>感悟</h2><p>跌跌撞撞又是一年，如果去年还是一个社会小萌新的我，现在已经晋升为一个社会混子。<br>对于很多事情（好的、坏的、有意思的、蛋疼的），都经历了一下。<br>看到了更多人与人之间的不同，性格、能力、爱好、语言，这个世界更有意思了。<br>也知道了很多人和人之间，并没有那么多差异，别人能做的，你也一样能做到，所谓的职业化也无非是时间的经历。</p>
<p>对于时间的理解有更深入了一层，时间无非是一个验证的过程，来验证你所理解的生活是否真的按你所知道。</p>
<p>总而，时间不会因你而改变，但你会融入时间。</p>
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          <p>以前有使用过两个数据源，就按照网上说的那样配置了两个TrancastionManager，总担心会出现跨库的事务。因为对于Mybatis如何使用TrancastionManager，不是很清楚。</p>
<p>在看小路的代码的时候，看到了他自己写了动态的DataSource切换。代码见详情。就觉得原来还能这么玩！！</p>
<p>但是呢，还是那个问题？是否能够保证事务的安全性呢？</p>
<p>结论是：无论使用的Spring还是Mybatis，其实都是使用的JDBC的connection的commit和rollback，无论怎么玩，其实只要在一个connection中都是安全的。</p>
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          <p>最近，JDK 13 刚刚发布，然而作为一名 javaer 还有好多东西不知道，有点蛋疼，最近都是在看架构什么的东西，发现有时候关注语言本身更有意思。刚好找到了一篇ZGC介绍的英文文章，翻译一下，学习一下。</p>
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            <a href="/blog/2019/08/30/2019/%E9%93%B6%E8%A1%8C%E4%BD%93%E7%B3%BB/" class="post-title-link" itemprop="url">银行体系</a>
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          <p>什么是金融业务？曾经我也会这样会问自己，因为对于我而言，钱应该是很真实的存在。它是看的见，摸得着的。</p>
<p>不过，最近开始从事金融相关的开发的时候，才对金融体系有了一个完整的概念。当然，这个概念也是迭代的。不妨说说我对于金融业务的理解，未来在来看看我的理解是否能为我的职业生涯带来一个转变。</p>
<p>这个转变来源于我对技术和业务的理解，TO B 和 TO C 的业务属性不一致，所以导致用户对于系统的容忍度是不一样的。对于C端用户，类似拼多多，可以不断地去骚扰用户。但是，用户还是能够接受。而如果支付宝做了一点窃取用户隐私的因为，那么后果是不堪设想的。</p>
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          <p>由于数据监管的要求，公司的数据必须放在不同的国家，蛋疼的是第一次感受到了光速的“慢”。数据存储于，印度，美国等，每一次查询都有200ms的延迟。而且这延迟是由于光速的限制，是物理限制，买再大的带宽也没有用。</p>
<p>只好自己写了一个主动缓存的方案。</p>
<p>挺有意思的, 可以参考参考~</p>
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          <img src="/docker_1.png" width="100%" height="100%" alt="Spring的发展"/>

<p>为什么需要Docker，从历史的脚本中可以看到，代码的直接越来越少，直接将Tomcat 和 Java 嵌入到 代码之中。</p>
<img src="/docker_2.png" width="100%" height="100%" alt="交付流程"/>

<p>运维应该考虑的是整体的稳定，而不是花大量的时间来关注代码的东西。</p>
<h1 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h1><p>最近看到了这个项目 spring-cloud-kubernetes，spring cloud组织已经开始针对K8S来做发展规划，看来是时候学习一波K8S了。</p>

      
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